Sash-lock.



No. 650,52l. Patented May 29, |900. S. 4W. SHAW & N. W. S-PAULDING.

SASH LUCK.

(Application tiled May 22, 1899.)

[No Model.)

I n1: 'nouns Enns co., muro-uwe.. wAsnmoToN, o, c.

UNITED STATES I PATENT (')EEICEo STEPHEN IV. SI'IAV AND NATHAN XV. SPAULDING, OF SAN FRANCISCO, CALIFORNIA.

SASH-LOCK.

SPECIFICATION forming part of Letters Patent N o. 650,521, dated May 2 9, 1900;

Application filed May 22, 1899. Serial No. 717,743. (No model 'Zb all whom'zt may concern:

Be it known that we, STEPHEN W. SHAW and NATHAN W. SPAULDING, citizens of the United States, residing in the city and county of San Francisco, State`of California, have in-V vented an Improvement in Sash-Locks; and we hereby declare the following to be a full, clear, and exact description of the same.

Our invention relates to improvements in locks or fasteners for the meeting-rails of sashes and like structures.

It consists of the parts and combinations of parts hereinafter described and claimed.

Figure 1 is a perspective view of the device, showing its application. Fig. 2 is a vertical section of the meeting-rails of the sashes, showing vthe lock in the position to open to separate the meeting-rails and open the window. Fig. 3 is a longitudinal section through the plates which carry the operating parts.

A and B are two plates, which are screwed, respectively, upon the top rail G of the lower sash and the bottom rail B of the upper sash. These plates have their meeting edges made, respectively, convex and concave, as shown at a and b, so that when drawn together in the act of fastening they interlock and engage and prevent any independent movement of the parts. This also prevents any access to the parts of the lock from the outside by inserting any implement through the space between the sash-rails.

Upon the plate B is fulcrumed a lever E by means of a fulcrum-pin, as shown at e, and upon the plate A is fixed a curved spur F. The curvature of the lower part of the back or convex sidexof this spur is upon a radius essentially about the pivot-pin e of the lever E when the two parts of the sash are closed, so that the plates A and B are in the same horizontal plane; but the radius of the upper part is from a different center, so that the top of the spur approaches more nearly to the lever-fulcrum, and this insures the proper engagement of the two.

The lever E has a slot made through it, as shown at E', and this slot will pass over the point of the spur F. When the sash-rails and plates A and B are closed together, any movement of either of the sashes which tends to carry the plates out of the same plane will change the radius of movement of the latchlever, and it will immediately bind against Y the curved spur F and prevent any further movement of the sashes. ,This movement of the latch over the spur in closing also acts to drawy the meeting edges of the sash-rails close together and to prevent rattling by reason of the different curves of the spur.

Upon the lower part of the lever E is a lug Il, which projects toward the sash G, and it lies normally beneath the overhanging edge of the plate A, as shown. Grooves or channels are made in the edges ofthe rails G and D coincident with this spur or lug, so that it may move freely when the latch-lever is turned. p

Vhen the sashes are closed, as shown in Fig. 1, and the latch engaged with the spur F, the lug H will lie Within the slot or channel in the sash D.

When it is desired to open the Window, the latch-lever is turned about its fulcrum, first disengaging itself from the point of the spur F, after which the lug H will strike the bottom of the plate A, and by the leverage afforded by the length of the latch-lever power may be applied to start the sashes, so that one may be raised or the other lowered. This enables the operator to overcome any tendency to stick which often manifests itself in windows of this class, and after the sash has been started it can be easily raised or lowered.

F.2 is a small stop projecting upon the opposite side of the bottom of the latch-lever and serves to limit the rearward movement of the lever and prevent it injuriously striking the glass of the upper sash. The upper end of the lever is bent into a hook form, as shown and thus throw the latch forward into en-v gagement with-the spur F. It will thus be IOC seen that it will be impossible to close the window without at the same time latchifng it, and the curved upper end E3 of the latch will prevent the latch assuming such a position that the sash-rail would strike it in closing when an attempt was made to close the window, and thus prevent the full closing. As the upper end of the spur F is interior to the arc of travel of the slot in the lever, it will insure the proper engagement of the two, even if the sash-rails should become considerably separated, and the change of curvature at the lower part of the spur acts, in conjunction with the latch-lever, to draw the sashrails together and make a tight joint.

Having thus described our invention, what we claim as new, and desireto secure by Letters Patent, is

l. Animproved sash-lock comprising plates fixed to the top of the meeting-rails of the sashes, one of said plates carrying a slotted sashes, a convex spur projecting upwardly from one of the plates, a lever fnlcrumed upon the other plate and having a slot made in its outer end adapted to pass over and engage the spur when the lever is turned down, a lug rigid Awith and projecting from one side of the fulcrumed end of the lever and adapted f to lie in the path of the edge of the spur-plate when the sashes are opened and the lever raised whereby when the sashes are closed i the spur-plate engages said lug and automatically trips the lever and throws it into @engagement with the spur, and a stop on the lever for limiting the opening movement of the latter.

lever and the other a spur having a convex curvature formed from two different centers,

'In wit-ness whereof we have hereunto set our hands.

STEPHEN W. SHAW. NATHAN W. SPAULDING. Witnesses:

S. II. NoURsE, JEssIE C. BRODIE. 

